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Yafang Shao f5b7a97920 cgroup: Make operations on the cgroup root_list RCU safe 
commit d23b5c577715892c87533b13923306acc6243f93 upstream.

At present, when we perform operations on the cgroup root_list, we must
hold the cgroup_mutex, which is a relatively heavyweight lock. In reality,
we can make operations on this list RCU-safe, eliminating the need to hold
the cgroup_mutex during traversal. Modifications to the list only occur in
the cgroup root setup and destroy paths, which should be infrequent in a
production environment. In contrast, traversal may occur frequently.
Therefore, making it RCU-safe would be beneficial.

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-08-19 06:00:06 +02:00
..
bpf
bpf: Synchronize dispatcher update with bpf_dispatcher_xdp_func
2024-08-03 08:49:45 +02:00
cgroup
cgroup: Make operations on the cgroup root_list RCU safe
2024-08-19 06:00:06 +02:00
configs
Kbuild: add Rust support
2022-09-28 09:02:20 +02:00
debug
kdb: Use the passed prompt in kdb_position_cursor()
2024-08-03 08:49:47 +02:00
dma
dma: fix call order in dmam_free_coherent
2024-08-03 08:49:49 +02:00
entry
entry: Respect changes to system call number by trace_sys_enter()
2024-04-03 15:19:44 +02:00
events
bpf, events: Use prog to emit ksymbol event for main program
2024-08-03 08:49:49 +02:00
futex
futex: Don't include process MM in futex key on no-MMU
2023-11-20 11:51:50 +01:00
gcov
gcov: add support for GCC 14
2024-06-27 13:46:22 +02:00
irq
genirq/irqdesc: Honor caller provided affinity in alloc_desc()
2024-08-14 13:52:58 +02:00
kcsan
kcsan: Don't expect 64 bits atomic builtins from 32 bits architectures
2023-07-19 16:21:37 +02:00
livepatch
livepatch: Fix missing newline character in klp_resolve_symbols()
2023-11-20 11:52:10 +01:00
locking
locking/rwsem: Add __always_inline annotation to __down_write_common() and inlined callers
2024-08-03 08:49:08 +02:00
module
modules: wait do_free_init correctly
2024-03-26 18:20:52 -04:00
power
PM: s2idle: Make sure CPUs will wakeup directly on resume
2024-04-17 11:18:22 +02:00
printk
printk: Update @console_may_schedule in console_trylock_spinning()
2024-04-03 15:19:44 +02:00
rcu
rcu: Fix rcu_barrier() VS post CPUHP_TEARDOWN_CPU invocation
2024-08-14 13:52:45 +02:00
sched
sched/smt: Fix unbalance sched_smt_present dec/inc
2024-08-14 13:53:00 +02:00
time
timekeeping: Fix bogus clock_was_set() invocation in do_adjtimex()
2024-08-14 13:52:58 +02:00
trace
tracing: Fix overflow in get_free_elt()
2024-08-14 13:52:59 +02:00
.gitignore
…
acct.c
acct: fix potential integer overflow in encode_comp_t()
2022-12-31 13:32:58 +01:00
async.c
async: Introduce async_schedule_dev_nocall()
2024-01-31 16:17:00 -08:00
audit_fsnotify.c
audit: fix potential double free on error path from fsnotify_add_inode_mark
2022-08-22 18:50:06 -04:00
audit_tree.c
…
audit_watch.c
audit: don't WARN_ON_ONCE(!current->mm) in audit_exe_compare()
2023-11-28 17:07:08 +00:00
audit.c
audit: Send netlink ACK before setting connection in auditd_set
2024-02-05 20:12:47 +00:00
audit.h
audit: remove selinux_audit_rule_update() declaration
2022-09-07 11:30:15 -04:00
auditfilter.c
ima: Avoid blocking in RCU read-side critical section
2024-07-11 12:47:16 +02:00
auditsc.c
audit,io_uring: io_uring openat triggers audit reference count underflow
2023-10-25 12:03:04 +02:00
backtracetest.c
…
bounds.c
bounds: Use the right number of bits for power-of-two CONFIG_NR_CPUS
2024-05-02 16:29:32 +02:00
capability.c
…
cfi.c
cfi: Switch to -fsanitize=kcfi
2022-09-26 10:13:13 -07:00
compat.c
sched_getaffinity: don't assume 'cpumask_size()' is fully initialized
2023-04-06 12:10:40 +02:00
configs.c
…
context_tracking.c
context_tracking: Fix noinstr vs KASAN
2023-03-10 09:33:45 +01:00
cpu_pm.c
context_tracking: Take IRQ eqs entrypoints over RCU
2022-07-05 13:32:59 -07:00
cpu.c
cpu/hotplug: Fix dynstate assignment in __cpuhp_setup_state_cpuslocked()
2024-07-05 09:31:56 +02:00
crash_core.c
vmcoreinfo: add kallsyms_num_syms symbol
2022-08-28 14:02:44 -07:00
crash_dump.c
…
cred.c
cred: switch to using atomic_long_t
2023-12-20 17:00:20 +01:00
delayacct.c
delayacct: support re-entrance detection of thrashing accounting
2022-09-26 19:46:07 -07:00
dma.c
…
exec_domain.c
…
exit.c
mm: optimize the redundant loop of mm_update_owner_next()
2024-07-11 12:47:13 +02:00
extable.c
context_tracking: Take NMI eqs entrypoints over RCU
2022-07-05 13:32:59 -07:00
fail_function.c
kernel/fail_function: fix memory leak with using debugfs_lookup()
2023-03-11 13:55:39 +01:00
fork.c
Revert "fork: defer linking file vma until vma is fully initialized"
2024-06-21 14:35:59 +02:00
freezer.c
freezer,sched: Rewrite core freezer logic
2022-09-07 21:53:50 +02:00
gen_kheaders.sh
kheaders: explicitly define file modes for archived headers
2024-06-27 13:46:24 +02:00
groups.c
security: Add LSM hook to setgroups() syscall
2022-07-15 18:21:49 +00:00
hung_task.c
sched: Fix more TASK_state comparisons
2022-09-30 16:50:39 +02:00
iomem.c
…
irq_work.c
…
jump_label.c
jump_label: Fix the fix, brown paper bags galore
2024-08-14 13:52:43 +02:00
kallsyms_internal.h
kallsyms: Reduce the memory occupied by kallsyms_seqs_of_names[]
2023-10-25 12:03:16 +02:00
kallsyms.c
kallsyms: Add helper kallsyms_on_each_match_symbol()
2023-10-25 12:03:16 +02:00
kcmp.c
…
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
…
Kconfig.preempt
…
kcov.c
kcov: properly check for softirq context
2024-08-14 13:52:58 +02:00
kexec_core.c
kexec: fix a memory leak in crash_shrink_memory()
2023-07-19 16:21:08 +02:00
kexec_elf.c
…
kexec_file.c
kexec: support purgatories with .text.hot sections
2023-06-21 16:00:55 +02:00
kexec_internal.h
panic, kexec: make __crash_kexec() NMI safe
2022-09-11 21:55:06 -07:00
kexec.c
kernel: kexec: copy user-array safely
2023-11-28 17:06:57 +00:00
kheaders.c
kheaders: Use array declaration instead of char
2023-05-11 23:03:02 +09:00
kmod.c
…
kprobes.c
kprobes: Fix to check symbol prefixes correctly
2024-08-14 13:52:54 +02:00
ksysfs.c
kexec: turn all kexec_mutex acquisitions into trylocks
2022-09-11 21:55:06 -07:00
kthread.c
Merge tag 'interrupting_kthread_stop-for-v5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2022-10-09 16:01:59 -07:00
latencytop.c
latencytop: use the last element of latency_record of system
2022-09-11 21:55:12 -07:00
Makefile
kernel/numa.c: Move logging out of numa.h
2024-06-12 11:03:16 +02:00
module_signature.c
…
notifier.c
notifier: Add blocking/atomic_notifier_chain_register_unique_prio()
2022-05-19 19:30:30 +02:00
nsproxy.c
Revert "fs/exec: allow to unshare a time namespace on vfork+exec"
2022-09-13 10:38:43 -07:00
numa.c
kernel/numa.c: Move logging out of numa.h
2024-06-12 11:03:16 +02:00
padata.c
padata: Fix possible divide-by-0 panic in padata_mt_helper()
2024-08-14 13:52:59 +02:00
panic.c
panic: Flush kernel log buffer at the end
2024-04-13 13:04:54 +02:00
params.c
…
pid_namespace.c
zap_pid_ns_processes: clear TIF_NOTIFY_SIGNAL along with TIF_SIGPENDING
2024-06-21 14:36:01 +02:00
pid.c
gfs2: Add glockfd debugfs file
2022-06-29 13:07:16 +02:00
profile.c
profiling: remove profile=sleep support
2024-08-14 13:52:50 +02:00
ptrace.c
freezer,sched: Rewrite core freezer logic
2022-09-07 21:53:50 +02:00
range.c
…
reboot.c
kernel/reboot: emergency_restart: Set correct system_state
2023-11-28 17:07:13 +00:00
regset.c
…
relay.c
relayfs: fix out-of-bounds access in relay_file_read
2023-05-11 23:03:03 +09:00
resource_kunit.c
…
resource.c
PCI: Allow drivers to request exclusive config regions
2023-09-13 09:42:46 +02:00
rseq.c
rseq: Use pr_warn_once() when deprecated/unknown ABI flags are encountered
2022-11-14 09:58:32 +01:00
scftorture.c
scftorture: Forgive memory-allocation failure if KASAN
2023-09-23 11:11:00 +02:00
scs.c
…
seccomp.c
…
signal.c
kernel: rerun task_work while freezing in get_signal()
2024-08-03 08:49:31 +02:00
smp.c
smp,csd: Throw an error if a CSD lock is stuck for too long
2023-11-28 17:06:55 +00:00
smpboot.c
smpboot: use atomic_try_cmpxchg in cpu_wait_death and cpu_report_death
2022-09-11 21:55:10 -07:00
smpboot.h
…
softirq.c
softirq: Fix suspicious RCU usage in __do_softirq()
2024-06-12 11:03:01 +02:00
stackleak.c
…
stacktrace.c
…
static_call_inline.c
…
static_call.c
…
stop_machine.c
Merge tag 'sched-core-2022-05-23' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2022-05-24 11:11:13 -07:00
sys_ni.c
syscalls: fix compat_sys_io_pgetevents_time64 usage
2024-07-05 09:31:59 +02:00
sys.c
getrusage: use sig->stats_lock rather than lock_task_sighand()
2024-03-15 10:48:22 -04:00
sysctl-test.c
kernel/sysctl-test: use SYSCTL_{ZERO/ONE_HUNDRED} instead of i_{zero/one_hundred}
2022-09-08 16:56:45 -07:00
sysctl.c
proc: proc_skip_spaces() shouldn't think it is working on C strings
2022-12-05 12:09:06 -08:00
task_work.c
task_work: Introduce task_work_cancel() again
2024-08-03 08:49:34 +02:00
taskstats.c
genetlink: start to validate reserved header bytes
2022-08-29 12:47:15 +01:00
torture.c
torture: Fix hang during kthread shutdown phase
2023-03-10 09:34:07 +01:00
tracepoint.c
tracepoint: Optimize the critical region of mutex_lock in tracepoint_module_coming()
2022-09-26 13:01:18 -04:00
tsacct.c
…
ucount.c
ucounts: Split rlimit and ucount values and max values
2022-05-18 18:24:57 -05:00
uid16.c
…
uid16.h
…
umh.c
freezer,umh: Fix call_usermode_helper_exec() vs SIGKILL
2023-02-22 12:59:50 +01:00
up.c
…
user_namespace.c
Merge tag 'ucount-rlimits-cleanups-for-v5.19' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2022-10-09 16:24:05 -07:00
user-return-notifier.c
…
user.c
…
usermode_driver.c
blob_to_mnt(): kern_unmount() is needed to undo kern_mount()
2022-05-19 23:25:47 -04:00
utsname_sysctl.c
kernel/utsname_sysctl.c: Fix hostname polling
2022-10-23 12:01:01 -07:00
utsname.c
…
watch_queue.c
kernel: watch_queue: copy user-array safely
2023-11-28 17:06:57 +00:00
watchdog_hld.c
watchdog/perf: properly initialize the turbo mode timestamp and rearm counter
2024-08-03 08:49:42 +02:00
watchdog.c
watchdog: move softlockup_panic back to early_param
2023-11-28 17:07:09 +00:00
workqueue_internal.h
…
workqueue.c
workqueue: Provide one lock class key per work_on_cpu() callsite
2023-11-28 17:06:55 +00:00